The standard physics object reconstruction is often inadequate for long-lived particles, and systematic uncertainties, relevant for the data analysis, have to be specially calculated. Initial basic requirements need to be revisited in order to avoid that events get rejected at early stages of the reconstruction. The interaction point constraint in triggering or reconstruction is not usable. Track finding is generally optimised for prompt particles, therefore dedicated tracking algorithms need to be developed. Secondary vertex finding is usually tailored to b hadrons, so the b tagging algorithms have to be extended to work also for impact parameters larger than a few millimetres. The particle flow algorithm [1]} that CMS is using needs to be adapted, since by design it uses and combines all available event information from the subdetectors, under the assumption of promptly produced particles. For all experiments, the reconstruction of non-promptly produced electrons and taus needs particular future development efforts. Instrumental effects, where possible, should be estimated from data.
